Durable anti-oil-fouling superhydrophilic membranes for oil-in-water emulsion separation

Fu, S, Xu, Y, Wang, H, Sun, F, He, J, Liu, Z, Xu, Z, Wang, Hongxia and Lin, Tong 2021, Durable anti-oil-fouling superhydrophilic membranes for oil-in-water emulsion separation, Journal of Polymer Engineering, vol. 41, no. 8, pp. 681-689, doi: 10.1515/polyeng-2021-0111.

Title Durable anti-oil-fouling superhydrophilic membranes for oil-in-water emulsion separation
Author(s) Fu, S
Xu, Y
Wang, H
Sun, F
He, J
Liu, Z
Xu, Z
Wang, HongxiaORCID iD for Wang, Hongxia orcid.org/0000-0003-0247-9791
Lin, TongORCID iD for Lin, Tong orcid.org/0000-0002-1003-0671
Journal name Journal of Polymer Engineering
Volume number 41
Issue number 8
Start page 681
End page 689
Total pages 10
Publisher Walter de Gruyter GmbH
Place of publication Berlin, Germany
Publication date 2021-09
ISSN 0334-6447
Keyword(s) durable
iron ion
Summary Abstract Marine mussel-inspired polydopamine (PDA) coatings show excellent hydrophilicity and substrate-independent adhesion ability, but low stability, especially in a harsh environment such as strong acid or strong base, significantly restricts their applications. In this work, we prepare a novel superhydrophilic and underwater superoleophobic coating based on a modified PDA. Diglycidyl resorcinol ether (DGRE) polyethyleneimine (PEI) and iron ions were incorporated into PDA to strengthen the cross-linking and coating durability. By using three chemically inert hydrophobic membranes, polytetrafluoroethylene (PTFE), poly(vinylidene fluoride), and polypropylene, as substrates, we showed that PDA/PEI/DGRE-coated membranes had a water contact angle (CA) of 0° and underwater oil CA above 157°, and their underwater oil SAs were <7°. The coating is durable against both physical and chemical damages including ultrasound and heat treatments, as well as acid/alkaline etching. After ultrasound treatment in water for 60 min, and heating treatment for 3 h, or acid/alkaline etching for 3 h, the coated PTFE membrane still showed water CAs of ∼0° in air and underwater oil CAs of ∼150°. The coated membranes can efficiently separate oil-in-water emulsions, even in strong acid and base environments. The water flux was above 1500 L m−2 h−1, and the oil rejection was above 99%.
Language eng
DOI 10.1515/polyeng-2021-0111
Field of Research 0912 Materials Engineering
HERDC Research category C1 Refereed article in a scholarly journal
Persistent URL http://hdl.handle.net/10536/DRO/DU:30153815

Document type: Journal Article
Collections: Institute for Frontier Materials
GTP Research
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